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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1af0a8115466f48d2ac2872fdcc8bc10d8f3fd955f3b9e3cb735f040f10baa19' 
  AND token = 'td+40f20H1BMzi0YU9C2Q89rhEZbfNxMM3bXNrZbkNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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