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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608c3ef4da5a639606534a60e564947d7b4f915b037e57aa8a721c63f94f2ed1' 
  AND token = 'v7I2EFwF74qHiXPfFjwppj2SbDUbxqUPpqoAY+a40l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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