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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd9c859e1884d69986ce4a36bc81b38925c6134603e0fbb9d617c1713fe5a1d8' 
  AND token = 'q5F+rhBCSjP6TwSoFgEqHa+7Labe4JsndgyYRBq8G1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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