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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb1b9465d3e87560e28afa4838553710fbae23b1b2c45254ca946d1a8571ff4' 
  AND token = 'bTTjtgLMbmBHIYc4lBqBn4Hypa/w3BXv6LE5Pehu3kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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