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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba20fa979d6b96032b91cf9f03225afdf56dda4470ffc64e2a98fa3afae5208' 
  AND token = 'H0ImWf2z9aH5vUCqKE2yCiCRnc35yFHifK8AH8fEJ0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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