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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7af2ef0687ad2e5480b00028c18dc12b542dddc97bd9ed92b9408ce79a62d02' 
  AND token = 'BzLdW/XtScQMiWFyqRZ6USuWiih97LZxQYMbsBk9PT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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