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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e338c3216ced33f8fa978de94f50ef0edbce7a9cbe5b048194f55e92474ec337' 
  AND token = 'B5QS3DZFyh4TkRh/zIzfRXXM9klRK6eBShpZFIVBb9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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