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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b00163274b8afe4a18a650b4ad6c0741b566e3cceafd87b07e198d284d3d26a' 
  AND token = 'Iw87oaD83+OI0OOLszqJlnDiXWWdbK5Hb9JdWHNZBtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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