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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09786987c3f547f2790986578ae78550dfe169bd4da6c567e1bdd90c97888023' 
  AND token = 'BGfB/YMKlOEa6D3dW8eXVt3vivThdU+D6CZGr78d1Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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