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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acfb56be06231356b0a10b6206f2a4289d04a8ec59adee0e773c4b7e0377cde7' 
  AND token = 'tvAirT32n3rvABgTQH7FJfuz/H3ApnOptybPKmDhl1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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