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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1689dfc515db13ab7457140fb412cf2a3794b1cac9f5a095ef60a09578acb59f' 
  AND token = 'VFS/Xcj0exg1wOXc8nYqFYGEBwNl9wbLs9YIcbBwSnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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