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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c91496dd1c07cfcbe0bfa2af014afbb9c0753eb10e89ecc1b1c6bdbdec2dbf6' 
  AND token = 'qB4Y5m0IWVHIBaUKboUAoIN35ZIIDU+fYtfwuPq4+ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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