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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f080c3e101c8b98f6aba87c6a839cd6f82b63199d37931235b32855e533da7' 
  AND token = 'ialTIIZ4vVxXdkoxhDSbrzxWnswXlxfTxIJmqtPv+/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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