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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd269a50215d8bbc12dc976c915c19beb06cf4a57c31e5ba397d94cbfd40e4b6' 
  AND token = 'ieNlvBiSI9fxcc2ihRxlcIfV/dJofjdov/3daH0W3/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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