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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de63cdb1c408ee4ba17641b6a1e23caa701bc58fdc43df46f90e5ed2e16a47f' 
  AND token = 'OV6+SZyrkjfGVMMuxrlobfI986E+iV6a8qSHMKODTyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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