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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b3b601176e254b44729323439debcebad1949de128a4e3c847d95c903b9aba' 
  AND token = 'ZdmleeOOy5rF/vg/o94/0oHpK+/KylPLP8fsfmJf8+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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