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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f899ba6c203d8fe4d5af0a75a312c14a5967c7c4dca245115696ff31ccff5e9' 
  AND token = 'fTXAj60mzKYTgT7x4wjhhaUJWBndbM2X7Kg9j0+UYME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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