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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a808ccbf6f6a3b7e96b6f729802c96ac7cb8fd54e3f820e70429037034db937' 
  AND token = 'hIiagvKS1ewcC4un81wzCUlN9dIeDBbnJIHnM+7azRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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