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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6276e4a4e4be409e7ae8e812535af36fbe205ec9267e05232e260d9577b93ac7' 
  AND token = 'vQJB2Vyg7gvUVXuaHY5r5DiQIbGUabBLyXXa2+63490=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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