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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b520b6ab9595b82f8bd186bb7e83f2d648a86b659e5d716fcbb14c98a965f7b3' 
  AND token = '3liLs+r95nDxsVrzQn4gvU5c5JTZXQIBI4b7atNs8gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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