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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90650603344647aa0f64b699de6408835b295a2d77cc67f370a3b2fc45fdf15b' 
  AND token = '+c1tWuefwZWiToO72PWyE+sfCC25vPlgikf6fKVRb38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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