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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0ff69aa440e3328368cd07faeda76e0e1bd0fdd7b84aad8b8abf6c3c0adecf' 
  AND token = 'o0ufH4Ims3LzEhlsqzJhtgg9vtYWcsb4FcvQg/068B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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