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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2152d16fa1d550f9d7c6c5c6abe3c78ccc30a743d109a71e99c1790ec183ce80' 
  AND token = 'JrRxaMew+tbPxn1o1+It0JV5dZ7obNgK1Y9OyJO3uek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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