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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731eacc50b8bc6d973167d71810c65a9cefe1c5aba4476a2482a316cf7fa76c5' 
  AND token = 'PoIba5mJCX61GtL/YQbNsBFS+NS1QZiX+5oTf/SYn9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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