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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5398c5dfd8157f9a1529c73ab2b0d8d67b30e1613fe327b0d3f32670103a7e' 
  AND token = 'ycncWP4NJ6QkiKHjolGbwmFMfwY/WbNpEPFF1hQ+ekY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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