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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d96238cefdf7f223841039c4444be3b7a4688c2a63c6313734f7299a943c449' 
  AND token = '7XMlml9Fwxctm2kjXIYPLypTfrejw5HO/VoWkVAbs+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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