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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c182cb1483be8cd00c4377e78704fe7d510343c6d08deb1da897f01c23443b' 
  AND token = 'm35WRw1yPR9JhGCXdtQquxrwNfRTz7QFk4I/C/QpCB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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