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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5dd5d4f1638a7cadea1cfcab9741c2f3de9b68918f2b059acb02ee9d1b66406' 
  AND token = 'XMO6KbcwF4YjnOGYQZdQ7EI8bbBdBJMwcsaEmVuOdR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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