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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be4d5790f9d0c23bbee2b6c1d464d7e188ceceb937592a16d03a688ad3d40e9' 
  AND token = 'Z17aTPo4G1JZMZY8FoUpNaZxGcRhP+4+Mj3hlAbFrp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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