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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f5143b415b8736fb30f8e51939bf2d8e9a89eab975c6e4f8ee11d0971befba' 
  AND token = 'cEdIFHEAJpqRWNucCSMJGHAKI3/t/3bJ4QIpA5f7rek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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