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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7636f0ea393b33633371d63220bfe75975bb3decf65848e41936b724f9b90298' 
  AND token = '373rfw3tivoEB2B5oJ4EKPt8130fs20xKnIPeKfle3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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