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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6269c463b84327b41a283ea735b64b4c6c271ded931a227bdeee15d6b905bad' 
  AND token = 'Z9afQXo3e24gmAYG8HQMTsc5yJ804CWuPC6DANPT3ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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