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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e61f076ad06b6f743353dc9de9c36b27724543ac949fb883c7d95da880a0ae' 
  AND token = 'xZh3Q7qtSe+tk61GZuPO77gdq/ruNXt36og2uQaRKI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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