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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2914d93d1d14dd17c9bfdd05d1ac92dbf267e6613c30d4d1457dfbe56cd9c71' 
  AND token = 'HZmAGTAWxbur/+HnhkOPJNOpld+LakfyHVo2ikBN2JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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