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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c1ddfcd4d08a19e2d5a7a95b96d9567be65d7c960d90498f88d20f8eca0937' 
  AND token = '6xRdN2D7eNaPh35CCGdoXOqPpgXT7qtFyEsBZQxTlyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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