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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b408b5289d31397f7c215ab1505be1398f5e4c6513e71e303ae4b7621116b0' 
  AND token = 'sOxANtZDcngen9lcc96FuNQNr6dMl23MRiU05Klw6Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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