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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cdd09e3468accc3a2b49a3f71e35ac63edda47c4f11223ae27844d66357685c' 
  AND token = '3kziozc9b2f9rqiVgOtoH3djS4w/P660V9sSBOp0Bz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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