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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56463031a9f8c53b68acf6f2f8fcb7fb40aa3d8b89e1ec7ac346acc5cdbece73' 
  AND token = 'O++upO8NWm+oWNnrPRkINRI4qOlC2pSmHF3/E7AXzPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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