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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cca1c6fb2881ed6f46bcd97d5dae24db6f71409737cdb40f180bd3189cf268f' 
  AND token = 'hmGyoxrEnP7QL/0u3fZtXjgje/BkiVxl+LUs7H8fids=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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