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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a84c2e778c944a08803cff265e6a9f47946c4451aeba96b5d4a09438597ffa6' 
  AND token = 'Ov1NcRfRkNLCRzbN3D22eAy4/6/X0UT8hH/mjbXNcmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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