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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f56c59eccae5a79f8b9503e7c1048bc895e3f0ced7008bc1d2ea640dcadf91' 
  AND token = 'pJl4v8UdGmbLoT7ec/D1tGVZXEx3L1WdIRBpv/2YA7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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