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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea79a3d5b49a11f81ca5d66eb0dcc7557683a35c3020bc81da649a704d8bc6e' 
  AND token = 'wjeF715YA02zQSGJIGzJalbK+yTq34+gkxRR270GzgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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