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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cba3f8fc9f7ee9278a9ea5c6de78d0b0c6af01d29baf2a211971562086486ab' 
  AND token = 'tRNIUn5T/t5+5N5L4K2aQuI5+NpQprj30zfIQe0PPVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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