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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6cf7211d19a2ac96141bee3f1b1239e2eddf3ec59e807394a71ba6c2248807c' 
  AND token = '0cUXvPTxIL4/6Yel0eoq9NPunGrxSNno7ktAbsIrZsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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