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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eade6b1a0cb2370e633fea6ccea53b6076cf73b2c3096205828fe8ed635a2d9' 
  AND token = 'aSEHd31yxKVTz/We5QygB6LekWp3kdyY/Iuw10C+JaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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