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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac91d074025a129a4def68bb91e4efa8477d20dfb5a9bf66e2764eb26719ae1' 
  AND token = 'HPGbtHfaObfzLVNh2UqYLVyEWb9Eiac9Ay2RvZ2N9EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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