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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6e1ead9447bcb657a28b380a4fe3b9a84dedff2b696bf71491f4ae92aa56cd' 
  AND token = 'BvDHcXlX7jvDBu71i+pXLm+JuN4J8HkyCM/ULa4tnoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}