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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81e9964de0b8c75354ce3802dcc131659f16dc1d7361d6456fab7eff9e6b0a31' 
  AND token = 'c1t7WEpG9GimHkgZ9jFQRbPOz2liKeKXoP/mqY+14i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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