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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79eefae2f9481d087a141e11eeca7eb0e0bc9a95077509e2d724c2041f4ac70a' 
  AND token = 'PRi8UxOyXXN3Xxl6eRov1T+C2ut+cuW35XMc09KO9uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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