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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde52701db42158d047dbf8cd0107147d79651f5040dcc82f812b7c49ec94cc7' 
  AND token = '3T9s6syVd2kT+AL37ceZX2oQqoTcsMIWJndy7byYS4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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