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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ff8a1d27dca96d14feba67fc162cea4048b6ecd0bfd669aae4628480cdb6dc' 
  AND token = 'U+QJ5J9Fl+MCfVWkcqLms9qeH23Tfkh2T/Pp2xdLcOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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