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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd32f5cab59f9763279b5b4241b74bda2b74e3f8d544c46252d39b4a8932354' 
  AND token = 'ORF3mviMyr91lckO1QfVjJtAR1CxdZAsviJevLgNeKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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