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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d71d63ceffff703502994055932f3ee92e6a0496cca2945a9057cad0a6f5cd8' 
  AND token = 'FIkQtf2zQSaPfu4T5DjoRFQyEqTUC9uliYI2x2pnrfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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