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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dceca2fd0ac235126f28f5c9cf5211991728a74887234d6a1677073b59ee624' 
  AND token = 'q3QjYour7xbAfKH/4zRy0h51fzWssVYum9t/Kxf6Mko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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