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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8317a9162550d3e436057e0148040dee25e923cf35c24fab0ab5bc5d926d285' 
  AND token = '6wDY1yglVnP6qM4cFQo66fKAxrzUGq+tegASajBKWsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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