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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f2a6bc5de83f2e5b711ec1c0851564c46d4c2ce944ff0137f9a7febc8cbaff3' 
  AND token = 'zUoBI5cc9T5jKKIEhY/slWP2Pf6fOUABZGab8Bc0X9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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